KR101235861B1 - Method and apparatus for receiving digital television broadcast data - Google Patents

Abstract

A technique for reducing power consumption by selectively turning off a frame receiving device while an unwanted service is being transmitted is disclosed. According to the digital television broadcasting data transmission and reception method according to the present invention, by generating a service frame group including all service frames and specifying a frame number for each service frame, service frames corresponding to a desired service can be received. When the RF receiver is powered on, and when receiving service frames corresponding to an unwanted service, the RF receiver can be turned off to save power, and the RF device is powered off for several consecutive frame periods. It is possible to rest more time continuously so that the power saving effect is excellent and the terminal can be operated for a longer time.

Description

Method and apparatus for receiving digital television broadcast data

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital television broadcasting, and more particularly to a technique for reducing power consumption by selectively turning off a frame receiving device while an unwanted service is being transmitted.

Television broadcasting used to be viewed from a fixed location. However, in recent years, this paradigm is changing. It is a paradigm that allows users to watch television broadcasts anytime and anywhere. In order to meet this paradigm shift, each company and manufacturer is trying to create a standard and terminal suitable for the mobile environment.

These standards and terminals should be designed considering the special environment of mobile. That is, the mobile terminal provides a service to a user using limited battery resources. Therefore, it should be designed to provide the service with the minimum battery resources while providing the service according to the regulations.

In order to reduce power consumption of the terminal, a technique for turning off an RF device or the like while a service that is not selected by a user is transmitted is required.

The present invention provides a digital television broadcast data transmission method and apparatus for reducing power consumption by selectively turning off a frame receiving device while a service which is not desired by a user, and the digital television broadcast data transmission method. A computer readable recording medium having recorded thereon a program for execution on a computer is provided.

Another technical problem to be solved by the present invention is to provide a method and apparatus for receiving digital television broadcast data, which can reduce power consumption by selectively turning off a frame receiving apparatus while a service which is not desired by a user, and the digital television broadcast data receiving method. To provide a computer-readable recording medium that records a program for executing the program on a computer.

According to an aspect of the present invention, there is provided a method of transmitting digital television broadcast data, the method comprising: generating or allocating at least one service frame for each service included in a channel; Designating a frame number for the generated or assigned service frame; Creating a service frame group including all the service frames with the specified frame number; And transmitting the service frame group.

In the step of designating the frame number, it is preferable to designate frame number 1 to the first service frame in the service frame group and to increase the frame number by one from the next service frame.

The generating of the service frame group may include generating service configuration information for the service frame group; And adding the service configuration information to the service frame, wherein the service configuration information preferably includes information indicating which service in a channel corresponds to each service frame included in the service frame group. .

According to an aspect of the present invention, there is provided a digital television broadcast data transmission apparatus comprising: a service frame generation unit for generating or allocating at least one service frame for each service included in a channel; A frame number designator for designating a frame number for the generated or assigned service frame; A service frame group generation unit for generating a service frame group including all of the service frames with the specified frame number; And a transmitter for transmitting the service frame group.

Preferably, the frame number designation unit designates frame number 1 to the first service frame in the service frame group and increments the frame number by one from the next service frame.

The service frame group generation unit may further include a service configuration information generation unit generating service configuration information and adding the service configuration information, wherein the service configuration information includes a service frame included in the service frame group for each service in a channel. It is preferable to include the information indicating whether or not applicable.

According to another aspect of the present invention, there is provided a method for receiving digital television broadcast data, the method comprising: obtaining frame numbers of at least one service frame corresponding to a desired service by analyzing service configuration information for a service frame group; Receiving a service frame having the obtained frame number among service frames included in the service frame group; And while the service frame does not have the obtained frame number is transmitted, the step of turning off the power of the RF device for receiving the service frame.

The frame number of the service frames, frame number 1 is assigned to the first service frame in the service frame group, and the frame number is increased by one from the next service frame.

The service configuration information may include information indicating which service in a channel each service frame included in the service frame group corresponds to.

The powering off of the RF device may include: obtaining a number of service frames that do not correspond to a desired service among service frames included in the service frame group; Obtaining a time to power off an RF device by multiplying the number of service frames by the length of a single frame; And powering off the RF device for the time to be turned off after receiving the last service frame among the service frames corresponding to the desired service.

According to another aspect of the present invention, there is provided an apparatus for receiving digital television broadcast data, comprising: a service configuration information analyzer configured to analyze service configuration information of a service frame group and obtain frame numbers of at least one service frame corresponding to a desired service; An RF receiver configured to receive a service frame having the obtained frame number among service frames included in the service frame group; And an RF power control unit for turning off the power of the RF receiver while the service frame having the obtained frame number is not transmitted.

The frame number of the service frames, frame number 1 is assigned to the first service frame in the service frame group, and the frame number is increased by one from the next service frame.

The service configuration information may include information indicating which service in a channel each service frame included in the service frame group corresponds to.

The RF power control unit obtains a number of service frames that do not correspond to a desired service among the service frames included in the service frame group, and multiplies the number of the service frames by the length of a single frame to turn off the RF receiver. An off time calculating unit obtaining a; And an off time timer for turning off the power of the RF receiver for a time to be turned off after receiving the last service frame among the service frames corresponding to the desired service.

According to the method and apparatus for transmitting digital television broadcast data and the method and apparatus for receiving digital television broadcast data according to the present invention, by creating a service frame group including all service frames and designating a frame number for each service frame, When receiving service frames corresponding to a desired service, the power of the RF receiver is operated, and when receiving service frames corresponding to an unwanted service, the power of the RF receiver can be turned off to save power. In addition, since the RF device is powered off continuously for several frame periods, the power saving effect can be excellent because more time can be continuously rested. As a result, the terminal can be operated for a longer time.

1 is a diagram illustrating a configuration of an existing ATSC system channel.
2 is a diagram illustrating a configuration of an improved ATSC system channel according to the present invention.
3 is a diagram illustrating a configuration of a service frame group according to the present invention.
4 is a block diagram showing the configuration of a digital television broadcast data transmission apparatus according to an embodiment of the present invention.
5 is a block diagram showing the configuration of a digital television broadcast data receiving apparatus according to an embodiment of the present invention.
6 is a block diagram showing the configuration of a digital television broadcast data transmission apparatus according to another embodiment of the present invention.
7 is a block diagram showing the configuration of a digital television broadcast data receiving apparatus according to another embodiment of the present invention.
8 is a flowchart illustrating a digital television broadcast data receiving method according to another embodiment of the present invention.
9 is a diagram illustrating a protocol stack of an A-VSB (Advanced-Vestigial Side Band) system.
10 is a diagram showing an embodiment in which the data transmission method according to the present invention is applied to an A-VSB system.
11 illustrates a format of an SIC according to the present invention.
12 illustrates the format of FIG. 11 in more detail.
Fig. 13 shows the contents of frame_group_information.
14 is a diagram illustrating a configuration of version_indicator_information.
15 is a diagram illustrating a configuration of additional_service_information.
16 is a diagram illustrating a configuration of turbo_channel_information.
Description of the Related Art
10, 12, 20, 22, 24: service channels
14, 30, 32, 34: service frames

Hereinafter, a method and apparatus for transmitting digital television broadcast data and a method and apparatus for receiving digital television broadcast data according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of an existing ATSC system channel. ATSC is a committee set up to consider the method of advanced television (ATV), the next-generation terrestrial television system in the United States. ATSC systems are the technical standard for the next generation of digital terrestrial television in the United States.

Referring to FIG. 1, channel 1 (CH 1, 10) and channel 2 (CH 2, 12) are interleaved in frames 14. In other words, data of a service (channel) is present in an RF frame. Therefore, there is no method for selecting a specific service and adjusting the power of the RF device.

2 is a diagram illustrating a configuration of an improved ATSC system channel according to the present invention. Referring to FIG. 2, in the system according to the present invention, channel 1 (CH 1) and channel 2 (CH 2) are divided and transmitted for each frame. In the example of FIG. 2, channels 1 20 and 24 are transmitted using frames 30 and 34, and channel 2 22 is transmitted using frame 32. Therefore, when a desired service on the receiving device side corresponds to channel 1, power consumption may be reduced by not receiving frame 32 which is a frame corresponding to channel 2.

3 is a diagram illustrating a configuration of a service frame group according to the present invention. In the present invention, by using such a service frame group, it is possible to reduce the power consumption of the receiving device.

3 illustrates a case in which three services 40 from service 1 to service 3 are included in a channel.

In the digital television broadcast data transmission method according to the present invention, a service frame group 50 including all services to be transmitted is generated. Each service corresponds to at least one RF frame 54. The RF frame corresponding to each service is called a service frame.

In the example of FIG. 3, service frames 1 to 4 correspond to service 1, service frames 5 to 8 correspond to service 2, and service frames 9 to 12 correspond to service 3.

3 illustrates a case where the service side receives the service 1.

Referring to the operation period 60 of the receiving device, the receiving device only needs to receive the service frame 1 to the service frame 4 corresponding to the service 1. Therefore, the reception device is turned off while the service frames 5 to 12 are transmitted. Preferably only the RF device of the receiving device is turned off.

After the service frame 12 is transmitted, the next service frame group is transmitted. When the service frame 1 included in the new service frame group is transmitted, power is supplied to the RF device of the receiving apparatus to receive the service frames. Thus, the time to turn off the RF device is determined in advance, so that the RF device is powered off only during the determined off time.

In order to predetermine time to turn off the RF device, service configuration information is generated and transmitted from the transmitting device to the receiving device. The service configuration information includes information indicating which service in each channel corresponds to each service frame. The receiver may use the service configuration information to know that service 1 corresponds to service frame 1 to service frame 4 of the entire service frames. Since the entire service frame is from 1 to 12, the service frame 5 to the service frame 12 is time to turn off the RF device. Therefore, the time to turn off the RF device is as shown in Equation 1 below. The time to turn off can be as little as alpha in some cases. That is, when the RF device needs a preparation time to receive the RF stream, or when there is an error because the clock of the terminal is not accurate, it is necessary to operate earlier than the scheduled off time. This preparation time is expressed in alpha.

4 is a block diagram showing the configuration of a digital television broadcast data transmission apparatus 400 according to an embodiment of the present invention.

Referring to FIG. 4, the apparatus for transmitting digital television broadcast data 400 according to the present invention includes a service frame generator 410, a frame number designator 420, a service frame group generator 430, and a transmitter 450. It is preferable to include.

The service frame generator 410 generates at least one service frame for each of the services included in the channel.

The frame number designator 420 designates a frame number with respect to the generated service frame.

The service frame group generator 430 generates a service frame group including all of the service frames. The service frame group generator 430 may further include a service configuration information generator 440 for generating service configuration information and adding the service configuration information to each service frame. The service configuration information includes information indicating which service in a channel corresponds to each service frame included in the service frame group.

The transmitter 450 transmits a service frame group.

In one embodiment, the frame number designator 420 designates the frame number 1 to the first service frame in the service frame group and increments the frame number by one from the next service frame.

5 is a block diagram showing the configuration of a digital television broadcast data receiving apparatus 500 according to an embodiment of the present invention.

Referring to FIG. 5, the apparatus for receiving digital television broadcast data according to the present invention 500 preferably includes a service configuration information analyzer 510, an RF receiver 520, and an RF power controller 530.

The service configuration information analyzer 510 analyzes service configuration information for a service frame group to obtain frame numbers of at least one service frame corresponding to a desired service.

The RF receiver 520 receives a service frame having a frame number obtained by the service configuration information analyzer 510 from among service frames included in the service frame group.

The RF power controller 530 turns off the RF receiver 520 while a service frame having no frame number obtained by the service configuration information analyzer 510 is transmitted. As a result, the power consumption of the RF receiver may be reduced without receiving a service frame corresponding to an unwanted service.

In the embodiment of FIG. 5, the RF power control unit 530 includes an off time calculator 540 and an off time timer 550.

The off time calculator 540 calculates the number of service frames that do not correspond to a desired service among the service frames included in the service frame group, and multiplies the number of the service frames by the length of a single frame to turn off the RF receiver. Find time to do This is equal to the time to turn off the RF device according to Equation (1).

The off time timer unit 550 turns off the RF receiver 520 for the time to be turned off after receiving the last service frame among the service frames corresponding to the desired service. According to this, the power of the RF receiver 520 is turned off after all the service frames corresponding to the desired service are received. When the time according to Equation 1 elapses, the RF receiver 520 is turned on again. (on) to receive service frames corresponding to the desired service again.

6 is a block diagram showing the configuration of a digital television broadcast data transmission apparatus according to another embodiment of the present invention.

The apparatus for transmitting digital television broadcast data according to the embodiment of FIG. 6 includes a service component 100, a packetizer 110, a muxer 120, a frame generator 130, and the like. It includes an emitter 140 and a frame slicing information inserter 150.

The service component 100 is a component that generates individual elementary streams (ES) constituting each service. For example, the A / V service corresponds to an audio component / video component.

The packetizer 110 configures each elementary stream ES as a packet. For example, an elementary stream (ES) is reconstructed into a transport stream (TS) packet.

Eater 120 multiplexes each packet. In the case of a transport stream (TS), a process of making each packet into a TS stream is performed.

The frame generator 130 configures the multiplexed packets into frames. In the case of the ATSC standard, interleaving is performed to generate a final frame.

The emitter 140 is a device for transmitting the generated frame using the RF.

The frame slicing information inserter 150 inserts information for frame slicing into the packet. The information for frame slicing is information including, for example, frame numbering information and a table for frame slicing.

7 is a block diagram showing the configuration of a digital television broadcast data receiving apparatus according to another embodiment of the present invention.

The apparatus for receiving digital television broadcast data shown in FIG. 7 includes an RF receiver 200, a frame skipper 210, a demuxer 220, a depacketizer 230, and a service processor. 240, system information processor 250, and control device 260.

The RF receiver 200 receives RF data.

The frame skipper 210 skips a frame corresponding to a service not selected by the user.

The demux 220 receives the data of the frame and divides it into respective packet streams.

The depacketizer 230 analyzes the packet according to the packet header information and delivers the data to a valid decoder.

 The service processor 240 is a kind of ES decoder. Each ES is collected to provide a valid service to the user.

 The system information processor 250 receives system information and transmits the system information to the control device. Examples of system information include frame slicing information.

The control device 260 receives the frame slicing information to skip the frame or controls not to operate the RF device for a predetermined time.

8 is a flowchart illustrating a digital television broadcast data receiving method according to another embodiment of the present invention.

FIG. 8 illustrates a process of the RF stage, and illustrates a process in which the data receiving apparatus receives the RF frame to make valid packet data.

First, by receiving the data (S100), it is determined whether the service configuration information is included (S110). If there is no existing service configuration information and the received data is not the service configuration information, data should continue to be received until service configuration information is received.

If the service configuration information is included in the received data, it is determined whether the information is updated than the service configuration information that is already present (S120). If the service configuration information is updated, it is necessary to analyze the service configuration information and reflect the information necessary to be reflected (S130).

The frame number assigned to the service frame is checked (S140) to determine whether the service frame corresponds to the desired service (S150).

If the desired service belongs to the frame, the service data is output (S160), it is determined whether there is a service termination command (S170), and the above process is repeated until there is a service termination command.

If the frame does not belong to the desired service, the frame is skipped (S180) and the RF device should not be operated for a predetermined time.

To this end, the RF device is powered off and a timer is set (S190). The set time of the timer is set to an off time according to Equation (1).

The timer checks whether the set time has been reached (S200), and continues to wait if the set time has not been reached (S210).

When the set time is reached, the RF device is turned on and the process is repeated again.

9 is a diagram illustrating a protocol stack of an A-VSB (Advanced-Vestigial Side Band) system. The A-VSB system supports the Supplementary Reference System (SRS) and Turbo applications. The SRS 300 adds and transmits a training sequence called an equalizer 302 which is data that can improve the reception performance of the terminal.

The turbo application 310 provides a channel through which additional data can be transmitted.

Data of the turbo application 310 is stored in the private data area of the adaptation field (AF, 325) of the ATSC Normal TS (320). Information about the SRS and turbo application is transmitted 340 via mode information 332 in Data Field Sync 330. Two DFSs exist in an ATSC transmission frame. The mode information 332 means information transmitted through the DFS 330.

The portion in which the turbo application data is transmitted is divided into a signaling information channel (SIC) 312 and a data channel 314. Each data channel 314 is divided into respective subchannels. Information about the subchannels is provided via the SIC 312 (342).

10 is a diagram illustrating an embodiment in which the data transmission method according to the present invention is applied to an A-VSB system.

10, each A-VSB frame 70 corresponds to a service frame according to the present invention, SIC corresponds to service configuration information according to the present invention, and a sliced frame corresponds to the present invention. Corresponds to the service.

In the example of FIG. 10, the contents 80 of the service configuration information SIC will be described.

The frame number of the frame is 25. The total number of frames is represented by using the frame number of the last frame, which is 42.

The channel contains two services. One service has a coding rate of 1/2, a start frame number is 1, and a total frame length is 21. Therefore, the service frame from frame number 1 to frame number 21 corresponds to the first service.

The second service has a coding rate of 1/4, with a start frame number of 22 and a total frame length of 21. Therefore, a service frame from frame number 22 to frame number 42 corresponds to the second service.

11 illustrates a format of an SIC according to the present invention. Referring to FIG. 11, the SIC according to the present invention includes version indicator information, frame group information, turbo channel information, additional service information, and padding. It is preferable to include the CRC and paddings and flags indicating the presence or absence of this information.

12 illustrates the format of FIG. 11 in more detail.

ServiceConfigurationInformation (SCI) is the minimum unit that enters the SIC. Only one SCI is included in an SIC in one frame.

Each flag set includes turbo_channel_information_flag, additional_service_information_flag, and padding_flag.

turbo_channel_information_flag indicates the presence or absence of turbo_channel_information ().

additional_service_information_flag indicates the presence or absence of additional_service_information ().

padding_flag indicates the presence or absence of a padding area.

Frame_group_information will be described in more detail with reference to FIG. 13.

Version_indicator_information will be described in more detail with reference to FIG. 14.

Turbo_channel_information () will be described in more detail with reference to FIG. 16.

The AdditionalServiceDescriptor 640 will be described in more detail with reference to FIG. 15.

CRC 660 represents an error detection method of SCI.

Fig. 13 shows the contents of frame_group_information.

The frame number 602 indicates the number of the current service frame.

The frame length 604 represents the total number of service frames included in the service frame group.

Since the A-VSB is a single carrier system, an RF frame is provided as a basic component unit that provides a service to support burst transmission. The RF frame consists of consecutive rows. Therefore, an intra-frame service allocation scheme cannot be used, and RF frames should be divided into distinguishable groups. Frame grouping is a method of dividing the columns of such consecutive RF frames into distinguishable groups.

A method of grouping frames includes a method of combining a start frame flag and an end frame flag (method 1), a method including a start frame flag and length information ( Method 2), a method of designating a frame number (frame 3), and the like.

In the first and second methods, when an intermediate frame is received, it is difficult to know where the received frame is located in the entire frame group. It is also difficult to detect when the size of a frame group changes. According to the third method, since there are no such disadvantages, it is preferable to employ the third method. The start of a frame group is numbered from frame one. After the largest frame number, the frame is again numbered 1st. This is called wrap up.

The size of the frame group and the interval length of each service frame can be changed by a signaling procedure in the system. If there is a change in the size of the frame group, it is possible to adjust when the service is repeated. For example, if the size of the frame group was 10 when the service was started, 10 frames are taken from the start of the first service frame of a service to the reception of the first service frame of the corresponding service of the next service frame group. When the information is updated and the size of the frame group is 20, 20 frames are required from the time when the first service frame of the corresponding service is started to the time when the first service frame of the corresponding service of the next service frame group is received.

Similarly, if the length of the service frame interval is changed, it can be changed by the signaling procedure. Changing the service frame interval length may cause the length of the service frame group. The length of the service frame group may not be changed by reducing the length of another service frame interval.

As a result, the section for turning off the power of the RF device can be adjusted.

14 is a diagram illustrating a configuration of version_indicator_information.

The version_indicator_information includes information on whether the service configuration information has been updated and information indicating when a later update will be made.

The resolution_flag represents a unit of the frame counter 614. In one embodiment, if the value of resolution_flag is 1, the frame counter 614 is 20 frames. If the value of resolution_flag is 0, the frame counter 614 is 1 frame.

The frame_counter indicates a later update time in one frame unit or 20 frame units. The exact unit depends on the value of resolution_flag.

Version 616 increments by one each time the service configuration information is updated.

15 is a diagram illustrating a configuration of additional_service_information.

additional_service_information is used to transmit additional service information in addition to the channel description information.

Additional_service_informatino can be divided into several blocks.

Current_index means the index of the descriptor current block.

Last_index means the index of the last block of the descriptor.

Length means the length of the current block.

User_data means actual description data.

16 is a diagram illustrating a configuration of turbo_channel_information. Turbo_channel_information indicates configuration information of each channel when the data of the turbo application is divided into several channels and transmitted.

The version means a version of the turbo channel information. This value is increased by one.

Turbo_channel number means the total number of turbo channels.

Turbo_channel_ID is identification information for identifying each turbo channel.

Turbo_fragment_bits represents the length of the turbo channel as an index value.

Coding_rates means coding rates of a turbo channel.

The SD_VFG_flag indicates whether the SD_VFG is applied in the turbo channel. If set, SD_VFG is applied.

SD_VFG refers to a technique for transmitting data by dividing the turbo channel into any number of frame units. In other words, it means to transmit data by the method proposed in the present invention.

Turbo_channel_index means the number of turbo channels.

Current_frame_number means the number of the start frame of the service.

Frame_block_number means how many frames the service consists of.

The present invention provides a system capable of turning on / off power of an RF device of a user terminal regardless of whether a service can be independently configured in a frame. This makes it possible to operate the terminal for a longer time than the conventional method. In addition, since the RF device is powered off continuously for several frame periods, the power saving effect can be excellent because more time can be continuously rested.

The present invention can be embodied as code that can be read by a computer (including all devices having an information processing function) in a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of computer-readable recording devices include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like.

Although the foregoing description has been focused on the novel features of the invention as applied to various embodiments, those skilled in the art will appreciate that the apparatus and method described above without departing from the scope of the invention. It will be understood that various deletions, substitutions, and changes in form and detail of the invention are possible. Accordingly, the scope of the invention is defined by the appended claims rather than in the foregoing description. All modifications within the scope of equivalents of the claims are to be embraced within the scope of the present invention.

Claims (6)

A method of receiving broadcast data in which broadcast data providing a broadcast service is divided into at least one channel, and each of the at least one channel is divided into at least one service frame and transmitted.
Receiving service configuration information indicating a broadcast service corresponding to each of the at least one service frame;
Obtaining a frame number of a service frame corresponding to a desired broadcast service based on the service configuration information; And
Processing only a service frame corresponding to the desired broadcast service using the frame number;
The service configuration information includes coding rate information indicating a coding mode of the at least one service frame. The method of claim 1,
Turning off the power of the RF device for receiving the service frame while the service frame does not correspond to the desired service. The method of claim 1, wherein the service configuration information,
And transmitting the data in addition to the at least one service frame. An apparatus for receiving broadcast data in which broadcast data providing a broadcast service is divided into at least one channel, and each of the at least one channel is divided into at least one service frame and transmitted.
A receiver configured to receive service configuration information indicating a broadcast service corresponding to each of the at least one service frame;
A service configuration information analysis unit for obtaining a frame number of a service frame corresponding to a desired broadcast service based on the service configuration information; And
An RF power controller configured to process only a service frame corresponding to the desired broadcast service using the frame number;
And the service configuration information includes coding rate information indicating a coding mode of the at least one service frame. The RF power control unit of claim 4,
And powering off an RF device for receiving a service frame while a service frame that does not correspond to the desired service is transmitted. The method of claim 4, wherein the service configuration information,
The data receiving device, characterized in that transmitted in addition to the at least one service frame.

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